I just got my Chibi in the mail last night. It's to small for me since it doesn't expand like the rest of the wig line. I does have a lot of head and hair room in the cap I've noticed.
It's 23" fixed circumference so I will need to expand it by 1" at the sides but it's a way better fit then the "Innocent" one is.
Altering it is doable but it would be a very time time consuming a nerving process if you not use to doing so with wigs. I'm use to is since most wig are to small to fit me I have to adjust most of them over the years to be larger. There are few steps to take first if your interested.
If you really love the colour of the wig I'd say go for it if you finding the cap to big and the circumference manageable. Padding the cap area will fill out the wig without needing to cut into it.
But maybe putting up in the marketplace and getting the Innocent in perky maybe a better options for you if do have a smaller head circumference then 21".
There also maybe some one on Taobao that will work better.